Lubricator.



G. H.'GILMAN.

LUBRIGATOB.

APPLIoATIoN PILBD JUNI: so, 1911.

Patend Aug. 6, 191:)A

UNITED sTATEs PATENT oEEroE.

GEORGE GILMAN, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR, T SULLIVAN MACHINERY COMPANY, OF CLAREMONT, NEW HAMPSHIRE, A CORIORA'TION l0F MAINE'.

rat-@mea Angle, 191e.

Original application filed January 3, 1911. Serial No. 600,403. Divided and this application led June 20. 1911. Serial No. 634.282.

.To all 'whom' it may concern.-

Beit known that I. GEORGE jH. GILMAN, a

' lcitizen of the Unitedl States, and a resident of Claremont, county of' Sullivan, Statev'of New Hampshire, (whose post-otliceaddress is Claremont, New Hampshire.) have invented anlmprovement in Lubrieators, of which the following description, in connection with the'aecompanying .'drawings, is a specification, like cliz'rracterson the drawings representing like parts.

This invention relates to engines and .'inore.' particularly, though not exclusively, t'o engines f the direct-acting type' such as are used in ,connection with rock drills and other stone working machines, being more K valve chamber of. ka .rock drill embodying particularly concerned with. improvements in the controlling valves and lubricating means for such engines.

` 'il-his application is a division of my priorl copending application Serial No. 600,403, filed January 3,1911.

Myfinvention will be best understood by reference to.the following description when taken in connection with the accompanying illustration of one' specific embodiment thereof, while its scope will be more particularly pointed out in theappended claims.

In the drawings: Figure 1 is al sectional.

elevation taken through ythe cylinder and 'one form of. my invention. 'Fig 24 is a'side elevation of the cylinder' ,and valve chamber; and Fig. '3, is a transverse sectional elevation on the'line 3 -3 in Fig. 2.

Referring ,to t-he drawings and more par.- ticula'r'l'y to 1, I have there shown for `the purpose of illustrating the invention,

-l-and 4cylinder 2 of a rock drill.

the Ipiston through The piston -rod 3 which projects 'the forward cylinder head 4 is shown broken away, `but these parts as well as the cutting to'ol to which the forward end'of the piston 'rodis-attached, the to'ol holding chuck and other usual construct'ional,V features of a rock drill Im'ay be of any well known construc- 'tion and do not materially concern the hereindescriloe'd invention. Referring more par-l ticularly-to the controlling valv'e (S the lat-- teris of. the pressure-actuated piston tvpe having a central head o'r spool 7 which alternately connects the supply chamber S -withthe .ports 9'zind 10,rthe former leading portion of' the valve. with one end ot' the exhaust space 1i). ll'hen the valve is reversed, the port 10 is connected with the supply chamber S andthe head end port 9 with the opposite end of the exhaust space 1 1Q. To reverse the valve the latter is provided at opposite ends withthe spools 13 and l-l which ,work in end lchambers to 'which pressure is alternately admitted by the movement of the piston tothrow the valve. Theehamber containing the head 13 is connected'by a passage 15 v(see dotted lines) leading'to the groove 16 in the cwalls of the cylinde1' .'and the chamber containing the head 1l is connected by means of the passage 1T' (sec dotted lines) with the groove 1 8 in the' cylinder' walls. These grooves are alternately uncovered by the reeiprocatory movement of the piston, the une covering of, a groove serving toadmit' pressure to that end of the valve chamber'with 4which the said groove is connected, such admission of pressure fluid reversing theV position of the valve. The fluid pressure is exhausted from that end of the valve cham-` ber opposite the end to which pressure is admitted by means of al circumferentialv groove 19 in the walls of the cylinder mid. way the length thereof, such groove (see Fig. 3 having` connection with the external atmosphere through the exhaust pipe or,

opening Q0. The circumferential groove 19,-

communica-tesl with a groove or reduced por-Q tion 21 in the walls of the piston byHm-Jans'Y ot' longitudinal grooves Q2 and Q3, so that' one end or the other of the valve chamber` 1 l. l

is kept 'tree from pressure fluid during s'ub- ,stantialliv the full stroke of the piston. The

is of greater diameter than the and 14 so that when the valve 1S `spool T spools 13 thrown to lonepositi'o'n or the other, for example the position shown in Fig. 1, it is there maintained by the excess pressure of the supply fluid against the central head over the pressure of the supply fluid against the smaller end head until the pressure fluid is admitted, as described, against the opposite end of the valve. This particular form of valve and the arrangement of controlling passages may be varied .within wide limits, or other forms of valves may be substituted `without departing from the spirit of my invention hereinafter more fully described.

In connection with the described forni of tool I have also provided means forl lubricating the engine through a supply of lubricant delivered to the pressure supply space in the valve chamber by means of the variations in pressure thereat. Referring to Figs. 2 and 3, in the walls of the cylinder between the cylinder and the valve casing there is provided a ychamber 24 for the reception of a supply of lubricant. introduced into the chamber through a lateral orifice normally closed by the threaded p1ug125 (Fig. 2).V The pressure in the supply space 8, which latter is connected with thesuitable source of pressure fluid supply through the lateral opening 2G, is not constant but is subject to periodic variations.

' When the valve is thrown and about its mid position, both the ports 9 and 10 are cut off from the supply space andthe pressure therein undergoes a sudden rise or upward fluctuation. When however the valve has passed this point, and reached the end of its stroke with one or the other port fully opened, the inrush of pressure fluid thereto causesla sudden drop or downward fluctuation in pressure.

When the upward pressure fluctuation occurs, pressure fluid is permitted to pass from the supply space to the oil reservoir y throughthe orifice'27 contained in the plug 28' threaded into the' walls of the cylinder. The plug contains a ball or other check valve 29 openlng vdownwardly or away from the opening so that when the pressure of the supply space exceeds that of the reservoir the -fluid pressure passes from the former to the latter. This raises, or builds up in y the reservoir a pressure which may be subs'tantially constant and uniform, or may fluctuate somewhat, according tthe circumstances. This pressure acts to force lubricant from -the lubricant reservoir through the feed passage to the pressure supp1 y space. From the lower end of the reservoir there is provided a duct or passage 30 leading back to the supply space but con-v trslled at its entrance thereto by means of a second check valve 31 adapted to open and allow the exit of lubricant into the supply space only when the pressure of the reservoir exceeds that the supply space. This,

`sure of the valve chamber drops.

The latter may behowever, occurs when the controlling valve G reaches the end of its stroke and at that instant the check valve yields and a quantity of oil isforced into the supply space by the superior pressure ,of the reservoir. On the next stroke of the valve upward pulsation of pressure in the supply space admits an additional supply of pressure fluid to the reservoir and this in turn forces an additional amount of lubricant to the supply space when the pres- This acticn being repeated with each stroke of the valve, an intermittent supply of lubricant is maintained for the valve chamber which is carried over into the engine cylinder with the pressure Huid admitted thereto. The

quantity of oil fed may be regulated by altering the tension on the check valve springs, such tension being herein adjustable by means of the threaded screws 32.

lVhile I have herein shown and described for ,purposes of illustration one specific forni of the invention, it is to be understood that the same is not limited to the details of construction or relative arrangement of parts, but that extensivedeviations may be made therefrom `without departing from the spirit thereof.

Claims. Y

l. n a pressure-fluid engine the combination with a piston and' cylinder of a pressure-actuated controlling valve having a valve chamber and pressure supply space, a lubricantreservoir having-a pair of passages communicating with said pressure supply space, an inwardly opening check valve in one passage and an outwardly opening check valve inthe other passage.

2. A pressurefluid engine having a piston and cylinder, a val"e chamber with pressure supply space located on one side of said cylinder, a lubricant reservoir between said pressure supply space and engine cylinder, a passage leading from the pressure supply space to the outer wall of said lubricant reservoir, a check valve controlling said passage and opening rtoward the lubricant reservoir, a second passage extending from nation with a valve having a pressure sup- 2 ply space and having also a lubricant reservoir provided with a feed passage leading to the pressure supply space, of means for utilizing the pulsations of pressure in the pressure supply space 'to forceI lubricant i from the lubricant reservoir through said feed passage to the pressure supply space.

4. In a pressure-fluid engine, the combination with a piston'and cylinder, the latter.

having `v a pressure supply space, of a valve I v eentrollin` communication between the c ll c y inder and they pressure supply space, said engine havlng a lubricantreservoir and a .eedpassage to feed lubricant from the reservoir to the pressure supply space, and means to communicate the pressure 'in the I pressure 'supply .space to the lubricant reservoir to feed lubricant from the lubricant r'eserfvoir through the said feed passage.

5. 'In a pressure-fluid engine,l thevcombination with a piston'andV cylinder, the lat- ;ter having a `pressure supply space', of a valve controlling communication between the pressure su ply space and the cylinder, seidA engine havng a lubricant reservoir, the latter having a pressure passage anda feed 4passage communicating with the pressure 'through 'the feed passage.

two subscribing witnesses.

6. In a pressure-Huid engine, the combi' a piston and cylinder, the lat# ter having a pressure supply space, of' a` nation wit valve controlling communication lbetween the pressure supply space and the cylinder,

said engine having also a lubricant reser Voir, the latter providedwith a pressure ricant-feed passage com' muneating 'with the pressure supply space,-

passage4 and a lu and a check valve in the pressure supply space permitting the passage of pressurer fluidto the reservoir under the pulsations of pressure in 'the pressure-fluid su ply space, thereby to cause the feed of lubrlcant t rough the said feed passage. In testimony whereof, I have signed my name to this specificati-on, in the presenceof GEORGE Witnesses:

'y CHAs. J. J ONES.

E. J. BURGHARD. I

H. GLMANL 

